Replace search_tap with search_taps

[BenMusch]

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Seems like this method call was missed in https://github.com/Homebrew/brew/pull/2548/files

I got this error earlier:

$ brew search caskroom/cask/jet
Error: undefined method `search_tap' for Homebrew:Module
/usr/local/Homebrew/Library/Homebrew/compat/global.rb:9:in `method_missing'
/usr/local/Homebrew/Library/Homebrew/cmd/search.rb:51:in `rescue in search'
/usr/local/Homebrew/Library/Homebrew/cmd/search.rb:48:in `search'
/usr/local/Homebrew/Library/Homebrew/brew.rb:95:in `<main>'

And a google search took me to that PR

Tests coming soon! Done!

[BenMusch]

Unrelated, but would it break docs to add a frozen_string_literal: true comment?

[MikeMcQuaid]

@BenMusch We're still using Ruby 2.0 here so let's skip that for now, thanks.

[MikeMcQuaid]

Thanks for your first contribution to Homebrew, @BenMusch (particularly fantastic work with the tests)! Without people like you submitting PRs we couldn't run this project. You rock!